Take a look at dolphin over here -
http://www.dolphin.zenwebhosting.com/frame_set.htm
They give you $100 off if you already have a Mach2 license. It will still cost $485, but is probably the best "cheap" CAM software out there. I use it exclusively on my lathe and it has managed to do everything I have asked of it. If you can find the extra money, you will be pleased in the long run. Just a thought, I got mine at christmas when it was on special offer. They may have one coming up, or you may want to be cheaky and ask them!